★原文转发自oracle版54powerman的《Oracle用Start with...Connect By》★Start with...Connect By子句递归查询一般用于一个表维护树形结构的应用。创建示例表：CREATE TABLE TBL_TEST( ID NUMBER, NAME VARCHAR2(100 BYTE), PID NUMBER DEFAULT 0); 插入测试数据：INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('1','10','0');INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('2','11','1');INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('3','20','0');INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('4','12','1');INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('5','121','2'); 从Root往树末梢递归select * from TBL_TEST start with id=1 connect by prior id = pid 从末梢往树ROOT递归select * from TBL_TEST start with id=5 connect by prior pid = id
|
